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qemu: block: Properly format storage slice into backing store strings

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When creating overlay images e.g. for snapshots or when merging
snapshots we often specify the backing store string to use. Make the
formatter aware of backing chain entries which have a <slice>
configured so that we record it properly. Otherwise such images
would not work without the XML (when detecting the backing chain).

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
This commit is contained in:
Peter Krempa 2020-02-12 17:25:12 +01:00
parent f36d751fa6
commit 73ca201467
1 changed files with 51 additions and 33 deletions
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20
src/qemu/qemu_block.c
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@ -1930,10 +1930,13 @@ qemuBlockGetBackingStoreString(virStorageSourcePtr src)
{
int actualType = virStorageSourceGetActualType(src);
g_autoptr(virJSONValue) backingProps = NULL;
g_autoptr(virJSONValue) sliceProps = NULL;
virJSONValuePtr props = NULL;
g_autoptr(virURI) uri = NULL;
g_autofree char *backingJSON = NULL;
char *ret = NULL;
if (!src->sliceStorage) {
if (virStorageSourceIsLocalStorage(src)) {
ret = g_strdup(src->path);
return ret;
@ -1970,12 +1973,27 @@ qemuBlockGetBackingStoreString(virStorageSourcePtr src)
break;
}
}
}
/* use json: pseudo protocol otherwise */
if (!(backingProps = qemuBlockStorageSourceGetBackendProps(src, false, true, false)))
return NULL;
if (!(backingJSON = virJSONValueToString(backingProps, false)))
props = backingProps;
if (src->sliceStorage) {
if (virJSONValueObjectCreate(&sliceProps,
"s:driver", "raw",
"U:offset", src->sliceStorage->offset,
"U:size", src->sliceStorage->size,
"a:file", &backingProps,
NULL) < 0)
return NULL;
props = sliceProps;
}
if (!(backingJSON = virJSONValueToString(props, false)))
return NULL;
ret = g_strdup_printf("json:%s", backingJSON);